All told, the general strategy is pretty straightforward: ramp up a variety of mana, fill your board with warriors, keep attacking to generate more warriors, and eventually trigger the ability mid-combat
Gemstone Array One key aspect of Gemstone Array is that it has no restriction on activations per turn or by tapping, so it is a clean way for infinite colorless mana to become colored mana
With the upcoming release of Disney Lorcana 's Shimmering Skies expansion, however, it looks like that track record will finally be changing
Skulking around at the back, as always, are Dimir
She also has a somewhat wordy ability attached to her that lets you draw a card if a creature an opponent controls dies with a toughness of zero or less